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Physics
Classical Physics
Mechanics
Static coefficient of friction decreasing with normal force?
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[QUOTE="Kinetic95, post: 5736307, member: 620653"] Yes I've included the weight of the metal block itself. I'm not sure what you mean by unaccounted mass? Sorry those values were just example values to show the the COF was decreasing. The type of values I am actually getting are: Normal force: 69.5N, 118.56N, 167.6N, 216.7N Static COF: 1.503, 1.375, 0.968, 0.769 I'm just wondering physically why this is. If friction partly comes from asperity junctions, won't an increasing normal force raise the number of these junctions (areas of contact), increasing the friction value/force? This would at least, as you say, keep the COF constant. Or is hysteresis in the rubber contact having an effect? I'm quite confused as I just don't see why the COF would be falling; I think there is another variable influencing the interaction, but I'm unsure what. [/QUOTE]
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Forums
Physics
Classical Physics
Mechanics
Static coefficient of friction decreasing with normal force?
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